Signal-Bandwidth Evaluation for Power Measurements in Electric Automotive Drives

The determination of the efficiency of an electric motor or an inverter in an electric vehicle requires power measurements on the ac side of the inverter. Voltage and current signals arise there from the switching operation of the inverter and are therefore hardly bandlimited. The finite bandwidth of measurement devices, like sensors or ADCs, yields to a bandwidth limitation of the measured signals. This limitation modifies the measured signals and has an effect on the calculated power. Measurement uncertainty considerations require the evaluation of the relation between this bandwidth limitation and the resulting error in the power measurement. This relation allows then for evaluating the significance of the spectral components for the power calculation and the decision which components are relevant and must not be filtered out by a bandwidth limitation. This paper presents an evaluation method for determining the bandwidth limitation error and identifies critical quantities in a numerical study.

[1]  Carmine Landi,et al.  Power-Quality Monitoring Instrument With FPGA Transducer Compensation , 2009, IEEE Transactions on Instrumentation and Measurement.

[2]  Carmine Landi,et al.  Measurement station performance optimization for testing of high efficiency variable speed drives , 1996, IEEE Trans. Instrum. Meas..

[3]  Dilip V. Sarwate,et al.  The frequency spectrum of pulse width modulated signals , 2003, Signal Process..

[4]  M. Schinkel,et al.  Efficient HF modeling and model parameterization of induction machines for time and frequency domain simulations , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[5]  Rado Lapuh,et al.  Evaluation of a 100 A Current Shunt for the Direct Measurement of AC Current , 2013, IEEE Transactions on Instrumentation and Measurement.

[6]  A. Boglietti,et al.  Experimental high frequency parameter identification of AC electrical motors , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[7]  D. Lindenthaler.  Signal-bandwidth evaluation for electric power calculation in PWM driven motors , 2014, 29th Conference on Precision Electromagnetic Measurements (CPEM 2014).

[8]  Yen-Shin Lai,et al.  The relationship between space-vector modulation and regular-sampled PWM , 1997, IEEE Trans. Ind. Electron..

[9]  Carmine Landi,et al.  Metrological performance improvement for power measurements on variable speed drives , 1997 .

[10]  S. Liu,et al.  High frequency PM synchronous motor model determined by FE analysis , 2006, IEEE Transactions on Magnetics.

[11]  T.A. Lipo,et al.  High frequency modeling for cable and induction motor overvoltage studies in long cable drives , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[12]  Roberto Langella,et al.  The Effects of Integration Intervals on Recursive RMS Value and Power Measurement in Nonsinusoidal Conditions , 2011, IEEE Transactions on Instrumentation and Measurement.

[13]  J. W. Kolar,et al.  Calorimetric Power Loss Measurement for Highly Efficient Converters , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[14]  Lorenzo Peretto,et al.  Study of the Accuracy Requirements of the Instrumentation for Efficiency Measurements in Power Conversion Systems , 2013, IEEE Transactions on Instrumentation and Measurement.

[15]  Gert Rietveld,et al.  Switching Sampling Power Meter for Frequencies Up to 1 MHz , 2013, IEEE Transactions on Instrumentation and Measurement.

[16]  Carmine Landi,et al.  Power measurements on high distorted signals : experimental comparison between two alternative developed device solutions , 1998 .

[17]  Markus Neumayer,et al.  Improved load modelling for switching power supplies in electrified vehicles , 2014, 2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE).

[18]  H. Akagi,et al.  Modeling and damping of high-frequency leakage currents in PWM inverter-fed AC motor drive systems , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[19]  Pasquale Arpaia,et al.  Real-time algorithms for active power measurements on PWM-based electric drives , 1995 .

[20]  U. Pogliano,et al.  Characterization of resistive dividers for a wideband power analyzer , 2014, 29th Conference on Precision Electromagnetic Measurements (CPEM 2014).